Phonograph



PATBNTED JAN. 19, 1904'l E. GILMAN PHONOGRAPH. APPLICATION FILED FEB. 4,1903.

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No. 749,857. PATBNTBD JAN. 19, 1904.

E. GILMAN PHONOGMLPH.y

APPLICATION FILED FEB. 4, 1903.

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I ua rel` Ina n N fJfQVX-@WW i UNITED STATES Patented January 19, 1904.

PATENT OFFICE.

PHoNoenAPH.

SPECIFICATION forming part of Letters Patent No. 749,857, dated January19, 1904.

Application filed February 4, 1903.

zen of the United States, and a resident of New i 1 Haven, in the countyof New Haven and State of Connecticut, have invented certain new anduseful Improvements in Phonographs, of which the following is a full,clear, and exact specification.

My invention relates to an improvement in phonographs; and it has forits object to provide means for the axial adjustment of the record onits driving-shaft. In phonographs which are fitted with automaticreturn-carrier or repeating actions it is desirable that the cylinder ordrum which carries the record should be capable of lengthwise adjustmenton the arbor or shaft which revolves it for the purpose of accommodatingor timing the period of phonographic action to the movement of thereturn-carrier, so as to avoid rotating the record beneath the speakerbefore the commencement of the piece or after the completion thereof andproducing a disagreeable scratching noise or other discordant result.

The invention consists in the novel method of securing therecord-cylinder upon the driving-shaft, and particularly in the novelspringfriction holder for clamping the cylinder to the shaft, whilepermitting free lengthwise movement of the same thereon and the parts ofthe mechanism, as hereinafter more 'fully described and claimed.

In the accompanying drawings, forming a part of this specification,Figure l is a sectional elevation of a phonograph provided with myimproved method of securing the record-cylinder to the driving-shaft.Fig. 2 is a plan view, partly in section, of Fig. 1; and Fig. 3 is across-section on the line X X of Fig. l. Figs. 4, 5, and 6 aresubstantially similar views of a modification.

Referring to the drawings, A designates the base-plate of the-phonograph provided with the h'xed standard B, having the center 7) andthe frame I), to which is hinged the gate E, having the center d, whichcenters, in connection with the intermediate bearing c', support thedriving-shaft F.

G represents the guide-rod upon which the serai No. 141,823. N0 model.)

reproducer-frame Z2 travels and to which section of anut e3 ada ted toengage and be driven by the screw-threaded portion e* of thevdriving-shaft. These elements are all old and wellknown and here requireno further description, the improvement comprising. my invention beingas follows: The hollow drum or cylinder H instead of being rigidlysecured on the driving-shaft F is loosely fitted thereon, and a curvedspring f/, extending the entire length of the interior of the cylinder,is interposed between the shaft and the cylindershell and adapted toexert spring-pressure and provide frictional engagement between them.The central part c" of the spring is curved to fit the shaft, and theends 2 are bent upward therefrom and impinge against the outer shell laof the cylinder. The spring is of such Width that it can easily beinserted through the hole in thecylinder-head, through which the shaft Fpasses, and in assembling the parts it is first slipped into thecylinder and the shaft afterward inserted to place. In operation thespring will hold the cylinder upon the shaft with sufficient friction tocause its rotation therewith, but will permit it to be readily movedlengthwise thereon, thereby enabling the record upon the cylinder to beso adjusted with re-` lation to the movement or travel of the repeatingmechanism of the phonograph when the machine is provided with such thatit will commence playing when the reproducer-frame commences to reverseor stop coincident with the return of` the frame, as desired. EX-cellent results are obtained with this improvement by adjusting thecylinder so that the reproducer-frame will be carried back to thestarting-point just at the end of. a piece played and timing thecommencement by placing a 'suitable washer m, upon the guide-rod G toIOO its length, which receives a block k12, fitted therein and providedwith means for preventing its escape outwardly through the opening-as,for instance; the shoulders kw, projecting under the shell at the endsof the opening. The spring 1 is arranged to press between the block k12and shaft to force the block outwardly as well as to create frictionupon the shaft. The block projects somewhat above the periphery of theshell when at its eXtreme outward travel and is adapted to yieldinwardly as a record is slid upon the drum to adjust and accommodateitself to the base of the same. This makes an expanding mandrel of thedrum and insures its holding the records securely, though they varysomewhat in thesize of the bore. A

Signed by me at New Haven, Connecticut, this 3d day of January, 1908.

EDWARD GILMAN.

Witnesses:

`JruvNIE HOLMES,

GEORGE L. BARNES.

